28080993 has 16 divisors (see below), whose sum is σ = 39802880. Its totient is φ = 17559504.

The previous prime is 28080979. The next prime is 28081007. The reversal of 28080993 is 39908082.

It is an interprime number because it is at equal distance from previous prime (28080979) and next prime (28081007).

It is not a de Polignac number, because 28080993 - 2⁸ = 28080737 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28080593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3480 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (2487680).

Almost surely, 2^28080993 is an apocalyptic number.

It is an amenable number.

28080993 is a deficient number, since it is larger than the sum of its proper divisors (11721887).

28080993 is a wasteful number, since it uses less digits than its factorization.

28080993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28080993 is about 5299.1502148930. The cubic root of 28080993 is about 303.9514039645.

The spelling of 28080993 in words is "twenty-eight million, eighty thousand, nine hundred ninety-three".